Vehicle seat

Abstract

A vehicle seat includes a seat frame, a bushing having a shape of a hollow cylinder and a pipe. The pipe is fitted to the bushing and attached to the seat frame. The pipe includes a body portion having a fitting diameter different from a fitting diameter of the bushing and a fitting portion formed at an end in an axial direction of the body portion and fitted to an inner periphery or an outer periphery of the bushing. The fitting portion is formed in a diameter-reduced or diameter-increased hollow cylindrical shape that is fitted to the inner periphery or the outer periphery of the bushing.

What is claimed is: 
     
       1. A vehicle seat comprising:
 a seat frame including a side frame of a seat cushion; 
 a bushing having a hollow cylinder; and 
 a pipe that is fitted to the bushing and attached to the side frame, the pipe including:
 a body portion that defines a hollow cylinder having an outer diameter greater than an inner diameter of the bushing; and 
 a fitting portion that is provided at an end in an axial direction of the body portion and that is fitted to an inner periphery of the bushing, the fitting portion defines a diameter-reduced hollow cylinder that is fitted into the hollow cylinder bushing at the inner periphery of the bushing; and 
 
 a plurality of lifter links rotatably coupled to the side frame and to a base on a floor, wherein 
 the bushing is a coupling shaft and at least one of the plurality of lifter links and the side frame are coupled to an outer periphery of the bushing such that the at least one lifter link is rotatable relative to the side frame, and 
 the fitting portion of the pipe is inserted into the hollow cylinder bushing in the axial direction through a coupling position of the at least one lifter link. 
 
     
     
       2. The vehicle seat according to  claim 1 , wherein
 the at least one lifter link is a drive link configured to receive a rotational driving force so as to drive at least one other lifter link of the plurality of lifter links, 
 the bushing is integrally joined to the drive link and rotatably coupled to the side frame, and 
 both of end portions of a first fitting area of the fitting portion are welded to the bushing. 
 
     
     
       3. The vehicle seat according to  claim 2 , wherein
 the drive link is integrally joined to a driving force transmission member via the bushing with the side frame interposed therebetween, and 
 the fitting portion of the pipe is inserted into the hollow cylinder bushing in the axial direction to a position passing through the coupling position of the drive link and a coupling position of the driving force transmission member, and 
 both end portions of a second fitting area of the fitting portion are welded to the bushing. 
 
     
     
       4. The vehicle seat according to  claim 1 , wherein
 the pipe tapers from the body portion to the fitting portion. 
 
     
     
       5. The vehicle seat according to  claim 1 , wherein
 the fitting portion of the pipe is inserted into the hollow cylinder bushing in the axial direction so as to extend over both the coupling position of the at least one lifter link and a coupling position of the side frame.